Pulp grinder



Nov. 3, 1925.

D. w. EIPPER PULP GRINDER Filed Feb; 728 1925 atkoz my Patented Nov. 3, 1925.

UNITED STATES: PATENT 0F DONALD w. EIPLPER, or memes FALLS, MASSACHUSETTS,

PULP enixpnn. 7

1,560,151 FICE 1 Application filed February 28, 1925- Serial No. 12,265. T

To all whom it may concern:

Be it known that I, DONALD IV. EIPPER, a citizen of the United States, residing at Turners Falls, in the county of Franklin and State of Massachusetts, have invented certain new and useful Improvements in Pulp Grinders, of which the following is a specification.

This invention relates to an improved pulp grinder, that is, to a device which is adapted to grind wood for disintegrating the fibers, so that they may be utilized in a desired capacity.

The principal object of the invention is to provide a wood pulping machine grinder which is exceedingly simple in construction, the same being composed merely from a rotary abrasive grinding element cooperating with and passing through a hopper, in which the blocks of wood are placed to be ground, and there being rotary means for acting on the blocks and crowding them into a restricted portion of the hopper to insure a fine segregation of the fibers to be used in the pulp formation.

Other features and advantages derived from the particular construction and arrangement of parts used will become apparent from the following description and drawings.

In the accompanying drawings, forming a part of this specification, and in which like numerals are employed to designate like parts throughout the same:

Figure 1 is a side elevation of a wood pulping or grinder machine constructed in accordance with the present invention, partly broken away and shown in section.

Figure 2 is an end elevation thereof.

Referring to the drawings in detail, it will be seen that the device comprises a metal ring or annular band 1, provided on its interior with circumferentially spaced transversely extending ribs 2. Confined between these ribs are arcuate blocks of abrasive material 3. These blocks are held in place by arcuate clamping plates or strips l, arranged on opposite sides thereof, and detachably fastened by screws or the like, to the opposite edges of the ring. The ring is provided with outwardly extending circumferentialfianges 5. Between the flanges 5 is an annular gear ring 6, with which a silent chain (not shown) has driving connection for imparting rotation to the band and abrasive element. Supported upon appropriate plates or the like- 7, are roller bearings 8, which are confined between the flanges 5. It will be noted that the rollers are arranged in arcuate rows and serve as an eflicientfsupport for the grinding ring.- 1 As before stated, a hopper 9 is'used in association with thedevice, the hopper being open. at one endand 'being relatively large at this end'and taperin'gto arather; restricteddischarge opening 10. It will be noted that the hopper is bowed longitudinally to conform to the contour of the grinder with which it cooperates. Also, on one side it is provided with a" slot 11 and the toothed periphery 12 of the wheel 13 operates through the slot.

In practice, the hopper, which is relatively stationary with respect to the rotary grinder, serves to receive the blocks of Wood to be ground. The rotary grinder is set into rotation, moving in the direction of the arrow and the wheel 13 is also set into rotation and moves in the same direction. The relation of the wheel to the hopper is fixed, as is shown in Figure 1, and it is obvious that the blocks of wood placed in the hopper are grasped by the teeth on the wheel and fed or literally jammed into the restricted discharge portion of the hopper, so that the wood will be ground into a fine pulp before it escapes from the hopper. In leaving the hopper, it is thrown by centrifugal force into an appropriate trough (not shown) which is provided.

Although it is not essential, the abrasive stones 3 are provided, on their opposite edges with sockets or the like 14, for use in removing the stones from the surrounding band. The stones will be made of sand stone, carborundum, or other similar material.

It is thought that the foregoing description will be sufficient to enable persons skilled in the art to which the invention relates to obtain a clear understanding of the same. For this reason, a more lengthy description is thought unnecessary.

Although the preferred embodiment of the invention has been shown and described, it is to be understood that minor changes coming within the field of invention claimed may be resorted to, if desired.

I claim:

1. In a pulp grinder of the class described, a supporting structure including opposed arcuate rows of anti friction and the abrasive material extending into the;

hopper through said open bottom, said hopper being adapted to receive the material to be ground, and means for feeding the material against said abrasive surface and toward the discharge end of said hopper. r

2. In a pulp grinder, a rotary abrasive element, a relatively stationary hopper open on one side, said abrasive element covering said open side, said hopper being decreased in size from itsintake to its discharge end, sald hopper belng formed in one of'its other sides with a slot, and a rotary Wheel extending through said slot and provided on its periphery with teeth adapted to engage and force, the wood into contact with the abrasive surface and toward the discharge end of; said hopper.

3. In a pulp grinder of the class described, anannular abrasive element, a substantially semi-circular hopper decreased in size from its intake toits discharge end, said hopper being relatively stationary and entirely open upon its bottom,'the abrasive elements extending into the hopper through said open bottom, and a rotary feeding wheel in association with said hopper.

In testimony whereof I aflix my signature.

DONALD WV. EIPPER. 

